Question

Resolva as equaçoes
a)6-2x-1=-3+x+4
b)7-3x-2-2x-3=0
c)10-9x+2x=2-3x
d)9-4x-4-5x=-6+90
e)2-3x=-2x+12-3x

Answer 1

a)
6 - 2x - 1 = - 3 + x + 4
5 - 2x = 1 + x
5 - 1 = x + 2x
4 = 3x
3x = 4
x = 4/3

b)
7 - 3x - 2 - 2x - 3 = 0
7 - 2 - 3 - 3x - 2x = 0
7 - 5 - 5x = 0
2 - 5x = 0
2 = 5x
5x = 2
x = 2/5

c)
10 - 9x + 2x = 2 - 3x
10 - 7x = 2 - 3x
10 - 2 = - 3x + 7x
8 = 4x
4x = 8
x = 8/4
x = 2

d)
9 - 4x - 4 - 5x = - 6 + 90
5 - 9x = 84
5 - 84 = 9x
- 79 = 9x
9x = - 79
x = - 79/9

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e)
2 - 3x = - 2x + 12 - 3x
2 - 3x = - 5x + 12
- 3x + 5x = 12 - 2
2x = 10
x = 10/2
x = 5